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Schedule I - Condensed Financial Information of Registrant - Condensed Balance Sheets (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Current assets:        
Cash and cash equivalents $ 124,929,000 $ 66,946,000 $ 61,739,000 $ 46,204,000
Accounts receivable, net 87,351,000 74,259,000    
Supplies, prepaid items and other 42,009,000 25,927,000    
Total current assets 328,106,000 242,668,000    
Property, plant and equipment, net 164,547,000 135,755,000    
Investments in and due from subsidiaries 2,910,000 4,016,000    
Other assets, net 9,356,000 9,558,000    
Total assets 502,009,000 387,981,000 338,633,000  
Current liabilities:        
Accounts payable 57,891,000 51,025,000    
Short-term financing 5,646,000 3,821,000    
Accrued and other liabilities 28,677,000 31,507,000    
Current portion of long-term debt 4,935,000 2,328,000    
Total current liabilities 97,149,000 88,681,000    
Long-term debt 74,525,000 93,064,000    
Noncurrent accrued and other liabilities 15,239,000 12,605,000    
Stockholders' equity:        
Common stock 2,664,000 2,548,000    
Capital in excess of par value 162,092,000 131,845,000    
Retained earnings 153,888,000 70,351,000    
Stockholders equity including treasury stock 321,644,000 207,744,000    
Less treasury stock (28,374,000) (28,374,000)    
Total stockholders equity 293,270,000 179,370,000 150,607,000 130,044,000
Total Liabilities and Stockholders' Equity 502,009,000 387,981,000    
Parent Company [Member]
        
Current assets:        
Cash and cash equivalents 35,302,000 7,491,000 23,071,000 25,720,000
Accounts receivable, net 15,000 12,000    
Supplies, prepaid items and other 5,833,000 275,000    
Due from subsidiaries 28,785,000 5,174,000    
Notes receivable from a subsidiary 10,000,000 10,000,000    
Total current assets 79,935,000 22,952,000    
Property, plant and equipment, net 229,000 274,000    
Investments in and due from subsidiaries 290,303,000 222,615,000    
Other assets, net 2,253,000 2,445,000    
Total assets 372,720,000 248,286,000    
Current liabilities:        
Accounts payable 291,000 275,000    
Short-term financing 5,646,000 0    
Accrued and other liabilities 1,036,000 1,038,000    
Redeemable, noncumulative, convertible preferred stock 44,000 45,000    
Current portion of long-term debt 0 8,000    
Total current liabilities 7,017,000 1,366,000    
Long-term debt 0 26,900,000    
Due to subsidiaries 56,243,000 24,536,000    
Noncurrent accrued and other liabilities 5,349,000 5,273,000    
Stockholders' equity:        
Preferred stock 3,000,000 3,000,000    
Common stock 2,664,000 2,548,000    
Capital in excess of par value 162,092,000 131,845,000    
Retained earnings 153,888,000 70,351,000    
Stockholders equity including treasury stock 321,644,000 207,744,000    
Less treasury stock 17,533,000 17,533,000    
Total stockholders equity 304,111,000 190,211,000    
Total Liabilities and Stockholders' Equity $ 372,720,000 $ 248,286,000